To explore novel pesticidal lead compounds with potential
activity,
a series of new benzamide compounds substituted with 1,2,4-oxadiazole-linked
pyrazole were designed and synthesized based on the active substructure
splice principle. The preliminary bioassay revealed that most compounds
exhibited good larvicidal activities against Mythimna separate, Helicoverpa armigera, Ostrinia nubilalis, and Spodoptera frugiperda. Additionally, all synthesized
compounds displayed potent antifungal activities against Pyricularia
oryzae, and 13h was the most active compound
with an inhibitory rate of 88.9% at the concentration of 50 mg/L.
The acute toxicity assay found that 13h was toxic to
zebrafish embryos with an LC50 value of 2.43 mg/L. Thus,
the strong insecticidal and antifungal properties of 13h, together with its moderate toxicity, make it a promising candidate
for a new pesticide lead.